Grand lunar,

The average pressure on mars is 7 mb. I have not been able to find any surface pressure data at the rover site. I will include a link on this post to the Viking one and two landing sites.

The pressure in these areas were between 6.7 mb and 10.2 mb year round. Well above the triple point.

http://www.atmos.washington.edu/loca...teorology.html

There is still hope.

dfrank